EP1649524A1 - Electroluminescent device with homogeneous brightness - Google Patents
Electroluminescent device with homogeneous brightnessInfo
- Publication number
- EP1649524A1 EP1649524A1 EP04744483A EP04744483A EP1649524A1 EP 1649524 A1 EP1649524 A1 EP 1649524A1 EP 04744483 A EP04744483 A EP 04744483A EP 04744483 A EP04744483 A EP 04744483A EP 1649524 A1 EP1649524 A1 EP 1649524A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- layer
- metallic structure
- electroluminescent device
- substrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000000758 substrate Substances 0.000 claims abstract description 24
- 239000010410 layer Substances 0.000 description 61
- 239000011521 glass Substances 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 6
- 229920002635 polyurethane Polymers 0.000 description 5
- 239000004814 polyurethane Substances 0.000 description 5
- 229920001609 Poly(3,4-ethylenedioxythiophene) Polymers 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- -1 polyethylene terephthalate Polymers 0.000 description 4
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 235000019353 potassium silicate Nutrition 0.000 description 3
- 238000007650 screen-printing Methods 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 2
- 229920001940 conductive polymer Polymers 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229920001467 poly(styrenesulfonates) Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 238000005488 sandblasting Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 229910001887 tin oxide Inorganic materials 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- RICKKZXCGCSLIU-UHFFFAOYSA-N 2-[2-[carboxymethyl-[[3-hydroxy-5-(hydroxymethyl)-2-methylpyridin-4-yl]methyl]amino]ethyl-[[3-hydroxy-5-(hydroxymethyl)-2-methylpyridin-4-yl]methyl]amino]acetic acid Chemical compound CC1=NC=C(CO)C(CN(CCN(CC(O)=O)CC=2C(=C(C)N=CC=2CO)O)CC(O)=O)=C1O RICKKZXCGCSLIU-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000002800 charge carrier Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 239000002346 layers by function Substances 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/805—Electrodes
- H10K50/81—Anodes
- H10K50/814—Anodes combined with auxiliary electrodes, e.g. ITO layer combined with metal lines
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
Definitions
- the invention relates to an electroluminescent device equipped with a substrate and a layer assembly comprising at least a first electrode, an electroluminescent layer and a second electrode.
- Electronically triggered display systems are known, and widely encountered, in various embodiments based on various principles.
- One principle uses organic light-emitting diodes, known as OLEDs, as the light source.
- OLEDs organic light-emitting diodes are constructed from multiple functional layers.
- a typical structure of an OLED is described in "Philips Journal of Research, 1998, 51, 467".
- a typical structure comprises a layer of ITO (Indium Tin Oxide) as the transparent electrode (anode), a conductive polymer layer, an electroluminescent layer, i.e.
- a structure of this kind is normally applied to a substrate, usually glass. The generated light reaches the observer through the substrate.
- An OLED with a light-emitting polymer in the electroluminescent layer is also designated a polyLED or PLED.
- the curve of the brightness as a function of the applied voltage of all organic LEDs is characterized by a threshold voltage, above which luminescence is observed, and a subsequent, very steep linear increase in brightness.
- the threshold voltage lies approximately in the range from 3 to 8 V.
- the brightness increases by approximately a factor of 4 when the applied voltage is increased by 1 V.
- Efficient OLEDs are characterized by a low threshold voltage, and are operated at low voltages from 2 to 8 V. In order to guarantee a uniform brightness over the emitting surface, the voltage drop over the cathode and anode must not be too great. In addition to a reduced brightness, the voltage drop also leads to a reduction in the efficiency of the OLED.
- the voltage drop U over an electrode of an electroluminescent device is described in good approximation by the following equation:
- F E cross-sectional area of the electrode
- F EL area of the electroluminescent device.
- a current density I of 2 mA-cm "2 is reached at an operating voltage of 5 V.
- the brightness of a 10 cm wide light source thus declines by more than a factor of 5 over the width.
- the brightness declines from the edge towards the center by more than a factor of 5.
- the specific resistance of the electrode comprising ITO may be reduced only linearly with the increasing of the layer thickness. However, this leads to increased manufacturing costs and a reduced visual transmission of the electrode.
- metals have a considerably smaller specific resistance than ITO, in order to achieve a sufficient visual transparency the layer thicknesses of metallic electrodes have to be so thin that no appreciable advantage is achieved as a result. It is therefore an object of the present invention to provide an electroluminescent device equipped with a homogeneous brightness over the entire electroluminescent device.
- an electroluminescent device equipped with a substrate, a metallic structure and a layer assembly comprising at least a first electrode, an electroluminescent layer and a second electrode, wherein the metallic structure is in electrical contact with the first electrode, and the layer resistance of the metallic structure is lower than the layer resistance of the first electrode. Owing to the electrical contact of the metallic structure with the first transparent electrode, the layer resistance of the first transparent electrode, and thus the voltage drop over the first transparent electrode, is reduced.
- the advantageous electroluminescent device may be obtained in a simple, cost-effective manner, without the manufacturing process having to be expanded with deposition and structuring steps. Furthermore, this embodiment is advantageous in the case of electroluminescent devices with thin layers.
- the layer resistance of the first electrode may be reduced particularly effectively.
- the proportional area of the metal is small compared with the overall area of the substrate, so reflection losses are low and the emission of the light is homogeneous.
- the pattern of the metallic structure may be matched to existing structures within the layer assembly.
- Fig. 1 shows, in cross-section, an electroluminescent device in accordance with the invention.
- Fig. 2 shows, in cross-section, a further electroluminescent device in accordance with the invention.
- an electroluminescent device is equipped with a substrate 1, preferably a transparent glass panel or a transparent plastic panel.
- the plastic panel may comprise, for example, polyethylene terephthalate (PET).
- Adjoining the substrate 1 is a layer assembly comprising at least a first electrode 2, an electroluminescent layer 3 and a second electrode 4.
- the first electrode 2 acts as the anode and the second electrode 4 acts as the cathode.
- the first electrode 2 is preferably transparent, and may, for example, comprise p-doped silicon, indium-doped tin oxide (ITO) or antimony-doped tin oxide (ATO).
- the first electrode 2 comprises ITO.
- the first electrode 2 is not structured, but rather is executed as a flat surface.
- the second electrode 4 may, for example, comprise a metal such as aluminum, copper, silver or gold, an alloy or n-doped silicon. It may be preferred that the second electrode 4 is equipped with two or more conductive layers. It may, in particular, be preferred that the second electrode 4 comprises a first layer comprising an alkaline earth metal, such as calcium or barium, and a second layer comprising aluminum.
- the second electrode 4 is preferably structured and equipped with a plurality of parallel strips comprising the conductive material or conductive materials. Alternatively, the second electrode 4 may be unstructured and executed as a flat surface.
- the electroluminescent layer 3 may comprise a light-emitting polymer or small, organic molecules. Depending on the type of material used in the electroluminescent layer 3, the device is designated an LEP (Light Emitting Polymer) or a polyLED or smOLED (Small Molecule Organic Light Emitting Diode).
- the electroluminescent layer 3 comprises a light-emitting polymer. Examples of materials that may be used as light-emitting polymers are poly(p-phenylvinylene) (PPV) or a substituted PPV, such as dialkoxy- substituted PPV.
- the electrodes 2, 4 When an appropriate voltage, typically of a few volts, is applied to the electrodes 2, 4, positive and negative charge carriers are injected, and these migrate to the electroluminescent layer 3, where they recombine and thereby generate light. This light travels through the first electrode 2 and the substrate 1 to the observer. If the electroluminescent layer 3 is doped with fluorescing pigments, the light generated by an electron hole recombination excites the pigments, which in turn emit light, for instance in one of three primary colors. Alternatively, the layer assembly may be equipped with additional layers, such as a hole transporting layer and/or an electron transporting layer. A hole transporting layer is arranged between the first electrode 2 and the electroluminescent layer 3.
- an appropriate voltage typically of a few volts
- An electron transporting layer is located between the second electrode 4 and the electroluminescent layer 3. Both layers preferably comprise conductive polymers.
- a hole transporting layer may, for example, comprise a mixture of polyethylene dioxythiophene (PDOT) and poly(styrene sulfonate).
- PDOT polyethylene dioxythiophene
- STYRENE poly(styrene sulfonate)
- Preferably incorporated into the substrate 1 is a metallic structure 5, comprising, for example, aluminum, copper, silver or gold or an alloy.
- the metallic structure 5 may, for example, comprise strips, in particular parallel strips. The distance between the individual strips may be, but does not have to be, constant.
- the metallic structure 5 may be a grid comprising a plurality of strips, arranged to be perpendicular in relation to each other.
- the metallic structure 5 may also comprise parallel wavy lines, zigzag lines, sawtooth lines or similar patterns. The pattern of the metallic structure 5 may thereby also be matched to existing patterns in the layer structure of the layer assembly.
- a grid comprising a metallic wire may be rolled into the still liquid glass.
- just individual metallic wires may also be rolled into the liquid glass.
- a further option for manufacturing a metallic structure 5 in a substrate 1 comprising glass comprises the generation, using known methods, of grooves in the substrate
- the metallic structure 5 may be applied to the substrate 1. This may be done by, for example, vapor deposition methods, screen printing of conductive metal pastes or by photolithographic methods. In both cases, it is preferred that the metallic structure covers not more than 10% of the surface of the substrate 1. In the event that the metallic structure 5 is located in the substrate 1, covering means that the surface of the substrate that adjoins the first electrode
- the layer resistance of a metallic layer also depends on the layer thickness, so the layer resistance of a thicker layer is lower than in the case of a thinner layer comprising the same conductive material. Owing to the electrical contact of the metallic structure 5 with a lower layer resistance than the first electrode, the layer resistance of the first electrode 2 is reduced overall.
- Embodiment Example 1 A 356 mm x 356 mm glass substrate 1 is coated with a photosensitive layer of polyurethane. The polyurethane layer was exposed and structured in such a way that the polyurethane was removed in strips over a width of 200 ⁇ m spaced at 20 mm.
- the grooves in the substrate 1 comprising glass were filled with a conductive silver paste by multiple screen printing operations.
- the layers of the layer assembly such as the first electrode 2 comprising ITO, a hole transporting layer comprising polyethylene dioxythiophene (PDOT) and poly(styrene sulfonate), an electroluminescent layer 3 comprising PPV and a second, unstructured electrode 4 comprising a first, 5 nm thick layer with barium and a second, 200 nm thick layer of aluminum, were then applied using known methods.
- Embodiment Example 2 A Cu wire grid with individual wires with a layer thickness of 400 ⁇ m and a width of 200 ⁇ m was rolled into a still liquid glass substrate 1. The distance between the individual wires was 25 mm. Following cooling and solidification of the glass substrate 1, the further layers were applied by analogy with embodiment example 1. An electroluminescent device with improved homogeneity of light emission was obtained.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04744483A EP1649524A1 (en) | 2003-07-16 | 2004-07-05 | Electroluminescent device with homogeneous brightness |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03102176 | 2003-07-16 | ||
PCT/IB2004/051115 WO2005008800A1 (en) | 2003-07-16 | 2004-07-05 | Electroluminescent device with homogeneous brightness |
EP04744483A EP1649524A1 (en) | 2003-07-16 | 2004-07-05 | Electroluminescent device with homogeneous brightness |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1649524A1 true EP1649524A1 (en) | 2006-04-26 |
Family
ID=34072635
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04744483A Withdrawn EP1649524A1 (en) | 2003-07-16 | 2004-07-05 | Electroluminescent device with homogeneous brightness |
Country Status (6)
Country | Link |
---|---|
US (1) | US20060180807A1 (zh) |
EP (1) | EP1649524A1 (zh) |
JP (1) | JP2007519177A (zh) |
CN (1) | CN1823431A (zh) |
TW (1) | TW200509429A (zh) |
WO (1) | WO2005008800A1 (zh) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI328984B (en) * | 2006-08-29 | 2010-08-11 | Ind Tech Res Inst | Substrate structures and fabrication methods thereof |
DE102006052029B4 (de) * | 2006-09-22 | 2020-01-09 | Osram Oled Gmbh | Lichtemittierende Vorrichtung |
US8884322B2 (en) | 2006-09-22 | 2014-11-11 | Osram Opto Semiconductor Gmbh | Light-emitting device |
CN101154643B (zh) * | 2006-09-25 | 2010-09-29 | 财团法人工业技术研究院 | 基板结构及基板结构的制作方法 |
FR2924274B1 (fr) * | 2007-11-22 | 2012-11-30 | Saint Gobain | Substrat porteur d'une electrode, dispositif electroluminescent organique l'incorporant, et sa fabrication |
CN102929047B (zh) * | 2008-02-28 | 2015-05-20 | 住友化学株式会社 | 透明薄膜电极 |
FR2938700A1 (fr) * | 2008-11-25 | 2010-05-21 | Commissariat Energie Atomique | Diode organique electroluminescente avec nervures electriquement conductrices au niveau de l'electrode inferieure, procede de realisation et panneau d'eclairage. |
EP2333863A1 (en) | 2009-12-11 | 2011-06-15 | Nederlandse Organisatie voor toegepast -natuurwetenschappelijk onderzoek TNO | Electro-optical device, electrode therefore, and method and apparatus of manufacturing an electrode and the electro-optical device provided therewith |
GB201007669D0 (en) | 2010-05-07 | 2010-06-23 | Epigem Ltd | Composite electrode for molecular electronic devices and method of manufacture thereof |
TWI450418B (zh) * | 2010-08-24 | 2014-08-21 | Advanced Optoelectronic Tech | 外延基板 |
FR2986909B1 (fr) | 2012-02-10 | 2014-11-21 | Saint Gobain | Electrode supportee transparente pour oled |
KR101760252B1 (ko) * | 2014-05-15 | 2017-07-31 | 엘지디스플레이 주식회사 | 유기발광소자 |
DE102014112618B4 (de) | 2014-09-02 | 2023-09-07 | Pictiva Displays International Limited | Organisches Licht emittierendes Bauelement |
DE102015100336A1 (de) | 2015-01-12 | 2016-07-14 | Osram Oled Gmbh | Verfahren zur Herstellung einer Trägervorrichtung für ein organisches Licht emittierendes Bauelement und zur Herstellung eines organischen Licht emittierenden Bauelements |
CN104900209A (zh) * | 2015-06-29 | 2015-09-09 | 深圳市华星光电技术有限公司 | 基于子像素信号亮暗切换时过驱动目标值的计算方法 |
KR101780893B1 (ko) * | 2016-03-10 | 2017-09-22 | 희성전자 주식회사 | 조명장치에 포함되는 전계 발광소자 및 이를 제조하는 방법 |
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JP2673739B2 (ja) * | 1990-07-31 | 1997-11-05 | キヤノン株式会社 | 液晶素子 |
JPH05307997A (ja) * | 1992-04-30 | 1993-11-19 | Pioneer Electron Corp | 有機エレクトロルミネッセンス素子 |
JPH09180639A (ja) * | 1995-12-25 | 1997-07-11 | Matsushita Electron Corp | 気体放電型表示装置およびその製造方法 |
TW364275B (en) * | 1996-03-12 | 1999-07-11 | Idemitsu Kosan Co | Organic electroluminescent element and organic electroluminescent display device |
US6433355B1 (en) * | 1996-06-05 | 2002-08-13 | International Business Machines Corporation | Non-degenerate wide bandgap semiconductors as injection layers and/or contact electrodes for organic electroluminescent devices |
JP2000082588A (ja) * | 1997-09-22 | 2000-03-21 | Fuji Electric Co Ltd | 有機発光素子およびその製造方法 |
US5986391A (en) * | 1998-03-09 | 1999-11-16 | Feldman Technology Corporation | Transparent electrodes |
KR100267964B1 (ko) * | 1998-07-20 | 2000-10-16 | 구자홍 | 유기 이엘(el) 디스플레이 패널 및 그 제조 방법 |
JP2000105548A (ja) * | 1998-07-31 | 2000-04-11 | Denso Corp | 表示パネル用電極基板及びその製造方法 |
JP2000260573A (ja) * | 1999-03-11 | 2000-09-22 | Hokuriku Electric Ind Co Ltd | 有機el素子 |
KR100694959B1 (ko) * | 1999-04-02 | 2007-03-14 | 이데미쓰 고산 가부시키가이샤 | 유기 전기 발광 디스플레이 장치 및 그의 제조 방법 |
TW465122B (en) * | 1999-12-15 | 2001-11-21 | Semiconductor Energy Lab | Light-emitting device |
JP4314746B2 (ja) * | 2000-02-24 | 2009-08-19 | セイコーエプソン株式会社 | 照明装置 |
WO2002032193A1 (en) * | 2000-10-09 | 2002-04-18 | Jeong Kwang Ho | Method and structure for substrate having inserted electrodes for flat display device and the device using the structure |
JP4030722B2 (ja) * | 2001-02-15 | 2008-01-09 | 三星エスディアイ株式会社 | 有機エレクトロルミネッセンス素子およびこの製造方法 |
US6569697B2 (en) * | 2001-08-20 | 2003-05-27 | Universal Display Corporation | Method of fabricating electrodes |
KR100404204B1 (ko) * | 2001-08-21 | 2003-11-03 | 엘지전자 주식회사 | 유기 el 소자 |
JP2003257645A (ja) * | 2002-03-05 | 2003-09-12 | Sanyo Electric Co Ltd | 発光装置およびその製造方法 |
US7368659B2 (en) * | 2002-11-26 | 2008-05-06 | General Electric Company | Electrodes mitigating effects of defects in organic electronic devices |
-
2004
- 2004-07-05 CN CNA2004800201626A patent/CN1823431A/zh active Pending
- 2004-07-05 WO PCT/IB2004/051115 patent/WO2005008800A1/en active Application Filing
- 2004-07-05 JP JP2006520048A patent/JP2007519177A/ja active Pending
- 2004-07-05 US US10/564,658 patent/US20060180807A1/en not_active Abandoned
- 2004-07-05 EP EP04744483A patent/EP1649524A1/en not_active Withdrawn
- 2004-07-13 TW TW093120899A patent/TW200509429A/zh unknown
Non-Patent Citations (1)
Title |
---|
See references of WO2005008800A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2005008800A1 (en) | 2005-01-27 |
TW200509429A (en) | 2005-03-01 |
CN1823431A (zh) | 2006-08-23 |
JP2007519177A (ja) | 2007-07-12 |
US20060180807A1 (en) | 2006-08-17 |
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